Newton's Laws: Examples to Explore

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Newton's First Law is illustrated by the example of sitting in a chair, where an object at rest stays at rest until acted upon by an external force. The Second Law is exemplified by the action of standing up, where applying double the force results in double the acceleration. Additionally, Newton's Third Law is demonstrated through the interaction of a finger pushing against a nostril, showcasing the equal and opposite reaction. These examples highlight the practical applications of Newton's Laws in everyday scenarios. Understanding these principles can enhance comprehension of motion and forces in the physical world.
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Anyone have any really good examples for Newton's 1st and 2nd Laws?
 
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I'm sure you can google-up a bunch of great examples in a few seconds.
 
How about:

As you sit in your chair, you are not moving violently about the room. Now, start standing up. If you push up twice as hard, you accelerate twice as fast.

Incredible, no?
 
Here's a really good example of Newton's 3.law:
Stick your finger in your nose. Notice that as the finger pushes on the nostril, the nostril squeezes back on the finger.
 
Seems like people might get hurt. :biggrin:
 
The rope is tied into the person (the load of 200 pounds) and the rope goes up from the person to a fixed pulley and back down to his hands. He hauls the rope to suspend himself in the air. What is the mechanical advantage of the system? The person will indeed only have to lift half of his body weight (roughly 100 pounds) because he now lessened the load by that same amount. This APPEARS to be a 2:1 because he can hold himself with half the force, but my question is: is that mechanical...
Hello everyone, Consider the problem in which a car is told to travel at 30 km/h for L kilometers and then at 60 km/h for another L kilometers. Next, you are asked to determine the average speed. My question is: although we know that the average speed in this case is the harmonic mean of the two speeds, is it also possible to state that the average speed over this 2L-kilometer stretch can be obtained as a weighted average of the two speeds? Best regards, DaTario
Some physics textbook writer told me that Newton's first law applies only on bodies that feel no interactions at all. He said that if a body is on rest or moves in constant velocity, there is no external force acting on it. But I have heard another form of the law that says the net force acting on a body must be zero. This means there is interactions involved after all. So which one is correct?
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